CHAPTER 7
REPAIR OF PUMP AND BRAKE ASSEMBLY
Section I. SYNCHROMATIC WINDMILL ASSEMBLY
Note installation details for use during reassembly.
7-1. General
c. Remove actuator (4) from adjusting screw (8),
noting its position for use during reassembly.
The synchromatic windmill assembly (fig. 7-1) is a
six-blade, adjustable pitch fan which is attached directly
Note:
to the pump and brake assembly (19, fig. 4-9). The
windmill assembly is operated by the airstream as the
For normal maintenance do not remove
helicopter moves forward in flight. It provides the power
roll pin and nut from adjusting screw.
required to pump insecticide spray fluid from the tank to
the spray nozzles.
d. Using a drift punch and a hammer, drive roll
pin (5) from adjusting nut (6) and adjusting screw (8).
7-2. Removal
e. Carefully note details of adjusting nut and
Remove the synchromatic windmill assembly from
screw in cap hub for use during reassembly. Adjusting
the pump and brake assembly by removing the three
screw must be free to turn in hub, but must have no play
attachment bolts (20, fig. 4-2).
or looseness. You may find it helpful to apply light
lubricating oil or penetrating oil to the adjusting screw to
7-3. Disassembly
free it in the hub. Before removing adjusting nut,
determine how far you must turn the nut to tighten it.
Disassemble the synchromatic windmill assembly
Record this information for later use. Then remove the
using figure 7-1 and the following steps as guides:
adjusting nut (6), washers (7), and adjusting screw.
a.
Lift cap hub assembly (1) from base hub (3).
b.
Remove blades (2) from base hub or cap.
7-1
